MC74VHCT244ADT

Overview

The MC74VHCT244ADT is an octal bus buffer and line driver from the VHCT logic family, manufactured by onsemi. It features eight non-inverting inputs and outputs with three-state capability, housed in a TSSOP-20 surface-mount package. The device operates within a supply voltage range of 4.5 V to 5.5 V, ensuring compatibility with standard CMOS logic levels. Key electrical specifications include a maximum propagation delay of 8.4 ns and a low static current consumption of 4 µA. It supports a wide operating temperature range from -55°C to +125°C and has a power dissipation rating of 833 mW.

Feature Summary

• Provides octal buffering and line driving functions with independent output control
• Features three-state outputs to facilitate bus-oriented memory and circuit designs
• Utilizes advanced VHCT technology for high-speed operation and low power consumption
• Ensures robust performance across extended industrial temperature ranges

Applications

• Bus-oriented memory and data storage systems
• Clock distribution and buffering circuits
• Industrial control systems requiring high reliability
• Computing equipment and telecommunications infrastructure

Procurement Notes

Verify the specific suffix 'D' indicates the TSSOP-20 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation or certified datasheets prior to integration. Ensure that ordering codes match the exact logical function and pinout requirements of the design specification to avoid compatibility issues during assembly.

Selection Notes

Select this component for applications requiring high-speed signal integrity with minimal power draw. The VHCT series offers superior switching speeds compared to standard HCT logic while maintaining CMOS noise immunity. Consider the thermal characteristics and package constraints when designing for high-density PCB layouts. Validate input voltage levels against the specified 4.5 V to 5.5 V operational window.

Part Context

This part belongs to the MC74VHCT244A series of octal buffers. It is distinct from similar parts like MM74HCT244MTC due to its faster propagation delay and wider temperature range. The VHCT family is designed to bridge the performance gap between HC and ACT logic families, offering improved speed without increasing power consumption significantly.

Replacement Considerations

Direct substitutes may include other octal 3-state buffers from the same VHCT family, such as the MC74VHCT244ADTR2G, which shares identical logical functionality but differs in tape-and-reel packaging. Verify pin compatibility and electrical parameters before swapping components.